CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Jing Huang,Li Wang
This study demonstrates a green and sustainable strategy for efficient single-step recovery of cerium through the rational design of core–shell Fe 3 O 4 @ZIF-8 nanocomposites. The material is comprehensively characterized in terms of morphology, magnetic properties, functional groups, and pore structure. Adsorption studies reveal pH-dependent recovery behavior, with optimal performance in the pH range of 3.9–7.2. Analysis of isotherms and thermodynamics confirms the endothermic nature of the recovery process, showing a monotonic increase in the maximum adsorption capacity from 110 mg g −1 to 185 mg g −1 as temperature rises from 283 K to 328 K. Notably, the effect of ionic strength (IS) suggests that NaCl significantly enhances Ce(III) recovery efficiency, while K 2 SO 4 exhibits marked suppression. Competitive adsorption experiments reveal stronger interference from heavy REEs (Ho 3+ /Tm 3+ ) compared to light REEs (La 3+ ). The fundamental mechanisms are elucidated through multiscale interaction analysis, revealing a synergistic process combining dual-phase transition dynamics and photoinduced redox reactions. The surface architecture of magnetic core evolves from initial ZnO-dominant nanocrystals to ZnO/CeO 2 heterostructures, and ultimately stabilizes as a CeO 2 -enriched framework with increasing Ce(III) concentrations. Moreover, across the time scale, the speciation of surface-adsorbed cerium underwent a gradual transition from Ce(III)-dominance to Ce(IV)-dominance, ultimately forming a regime where Ce(IV) (CeO 2 ) served as the primary species. This progressive transformation enables in situ immobilization and single-step recovery of Ce(III) under mild conditions, establishing a novel paradigm for REEs recovery technology.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yuanqian Xiong,Xiaoyu Gao,Yu Wang,Xiangrui Deng,Chunhong Xiong,Jinsheng Zhang,Qianhui Gu,Ganhui Huang
Norfloxacin (NOR) is now extensively used for the treatment of human and animal diseases. Unfortunately, large accumulations of NOR will pose a significant threat to the human body. Thus, it is urgent to develop a rapid and sensitive detection technique for the trace determination of NOR. In this study, an electrochemical molecular imprinting sensor with great properties was fabricated for the determination of NOR in milk and environmental water. The incorporation of bovine serum proteins produced a hybrid recognition interface consisting of molecularly imprinted polymers and peptides that provided good recognition properties for norfloxacin. The Fe 3 O 4 @ZIF-8 was distributed orderly on the electrode after the embedding of the magnets inside the electrode, then the BSA was coated on the electrode with the electrodeposited AuNPs through Au-S bonding. The sensor constructed in this study achieved ultra-sensitive detection of norfloxacin with an effective area of 0.08433 cm 2 , a limit of detection (LOD) of 0.108 pmol·L −1 , and a wide linear range (1 ∼ 100, 100 ∼ 1000 and 1000 ∼ 8000 pmol·L −1 ). The prepared sensors exhibited satisfactory performance in the detection of milk and environmental water, with acceptable recoveries ranging from 96.24 % to 104.88 %, and the relative standard deviation (RSD) was no more than 4.84 %.
研究领域:
分析化学
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生物传感技术
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环境科学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
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IF 10.53
Yonghong Wang,Lecheng Sheng,Xinru Zhang,Jinping Li,Rong Wang
Carbon molecular sieve (CMS) membranes have great promise in CO 2 capture. However, tortuous transport passageways restrict the enhancement in the permeability due to the presence of disordered porous structure and dead-end pore. Herein, the growth of ZIF-8 layer on the surface of Fe 3 O 4 formed magnetic core-shell Fe 3 O 4 @ZIF-8 particles, which were fixed into 6FDA/ODA:DABA polyimides under magnetic field-induction to fabricate a precursor membrane with vertically oriented chain-like particles. It was then pyrolyzed to form hybrid carbon molecular sieve (HCMS) membranes with ordered microporous structure under high temperature conditions. The cross-section scanning electron microscopy images and N 2 adsorption for resultant HCMS membranes indicate that Fe 3 O 4 @ZIF-8-derived carbons frameworks were vertically oriented to form the ordered microporous structure, which also had good compatibility with carbon matrix stemmed from 6FDA/ODA:DABA polyimides. The as-prepared HCMS membranes embedded with 5 wt% Fe 3 O 4 @ZIF-8 manifested a highest gas separation performance (permeability of 5130 Barrer; CO 2 /N 2 selectivity of 29; CO 2 /CH 4 selectivity of 48), outperforming the pristine CMS membranes, which were near and beyond 2019 CO 2 /N 2 and CO 2 /CH 4 upper bounds, separately. These good separation performances resulted from vertical chain-like microporous particles, which provided fast transport channels to accelerate CO 2 diffusion rate. In addition, we supposed that Fe 3 O 4 prevent ZIF-8 frameworks from destruction during the pyrolysis and promote the size screening capability. More importantly, this membrane exhibited excellent aging resistance over 30 days aging testing compared to pristine CMS membranes. Therefore, it affords a feasible way for carbon capture from flue gas and natural gas.
研究领域:
材料科学
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化学工程
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环境科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2023
·
IF 5.8
Wanling Cai,Wei Zhang,Zuliang Chen
Metal-organic frameworks (MOFs) have a high specific surface area and inherent biodegradability due to their unique structure and composition . As well, owing to the properties of nanomaterials and especially their magnetic features, Fe 3 O 4 nanoparticles and MOFs composite materials have great potential in the design and application of drug release. The present work: firstly, investigated norfloxacin loading in magnetic metal organic framework (Fe 3 O 4 @ZIF-8); and secondly, studied the release of norfloxacin and its antibacterial activity . Results showed the release efficiencies reached 97 % at 310 K after 84 h (pH 7.4). Drug release behavior was tested at various pH levels and it was found that Fe 3 O 4 @ZIF-8 has pH-sensitive properties. Furthermore, the release model calculation illustrated that the release process fitted well to the Bhaskar model. The magnetic properties of Fe 3 O 4 @ZIF-8 confirmed that the composite has potential application for a targeted drug delivery system. The mechanism of pH-responsive norfloxacin release was combined with diffusion , ion exchange and electrostatic repulsion. Furthermore, the antibacterial activities of Fe 3 O 4 @ZIF-8 and NOR-Fe 3 O 4 @ZIF-8 were tested against Escherichia coli . Results showed that Fe 3 O 4 @ZIF-8 had good biocompatibility while NOR-Fe 3 O 4 @ZIF-8 can deter or inhibit the actions of microorganisms .
研究领域:
纳米技术
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药学
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材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2023
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IF 5.8
Jidong Wang,Yating Zhang,Min Dong,Zhaopeng Liu,Binbin Guo,Haipeng Zhang,Liming Gao
Detecting and analyzing circulating tumor cells(CTCs) is significant for early diagnosis, management, and personalized treatment of tumors. Herein, a smart magnetic aptamer modified Fe 3 O 4 @ZIF-8 core/shell structured nanoparticle (NPs) was successfully constructed using for capture and simultaneous pH- and NIR-irradiation responsive release of CTCs. Taking MCF-7 as model CTCs, it could be captured ca. 60 % in low-concentration artificial blood by aptamer (SYL3C) on the surface of Fe 3 O 4 @ZIF-8 NPs. After magnetic separation, the ZIF-8 shell in aptamer-modified Fe 3 O 4 @ZIF-8 NPs carrying captured CTCs would disintegrate within 20 min under the synergistic effect of an acidic environment (pH=6.0) and NIR irradiation leading to the release of CTCs with high cell viability , which was benefited for the subsequent culture and analysis. This magnetic and core/shell structured device integrated high-efficiency capture, quick isolation and perfect release into one system, which showed great potential s for the detection of CTCs in the clinic.
研究领域:
生物医学工程
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纳米技术
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癌症诊断
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细胞生物学
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 48
·23112-23118
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IF 3.925
Xiaoxun Liu,Jilin Zhang,Yunyun Lei,Zi Dai,Xiaoya Zhao,Guixia Liu
Metal–organic framework (MOF) materials have great potential for solving dye contamination problems due to their excellent organic dye adsorption properties. However, MOF adsorbents present a tremendous drawback of poor separability. Herein, core–shell Fe3O4@ZIF-8-PSS with abundant active sites and sensitive magnetic responses was synthesized in one step via simultaneously introducing imidazole ligands and poly(sodium-4-styrenesulfonate) (PSS) modifiers into the dispersion of Fe3O4 microspheres. These magnetic Fe3O4@ZIF-8-PSS microspheres can be magnetically separated and recovered in only 10 seconds. Moreover, the addition of PSS increases the active sites of Fe3O4@ZIF-8-PSS, which is more favorable for the adsorption of organic dyes. The maximum adsorption capacity for crystal violet (CV) can reach 382 mg g−1. The adsorption process was consistent with the Langmuir isotherm and pseudo-second-order kinetic models. The adsorption mechanism of Fe3O4@ZIF-8-PSS for CV is mainly attributed to electrostatic interactions and π–π interactions. The effects of solution pH and coexisting ions on the adsorption capacity were adequately discussed. These studies suggest that Fe3O4@ZIF-8-PSS not only has efficient adsorption properties but can also be easily separated by external magnetic fields after being used for organic dye wastewater treatment, which may endow it with considerable potential for wastewater treatment.
研究领域:
材料科学
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环境工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 10
·4091-4098
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IF 4.58
Liu Haochi,Chen Ligang,Ding Jie
The authors describe an efficient method for the extraction of tetracycline antibiotics (TCs) from water samples by using a new kind of core-shell adsorbent. It consists of a magnetite (Fe 3 O 4 ) core and a metal-organic framework (type ZIF-8) as the shell. The sorbent has a large specific surface and superparamagnetic response. The sorbent was characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, nitrogen adsorption, and X-ray diffraction. The adsorption isotherms, dynamic adsorption, and mechanisms of interactions between tetracycline and sorbent were studied. Various parameters affecting the extraction efficiency were optimized. Following desorption of the TCs with methanol (containing 1% of acetic acid), they were quantified by using ultra-high performance liquid chromatography combined with mass spectrometry. The method has a linear range that extends from 0.5 to 50 ng·L −1 , and the limits of detection for tetracycline, chlortetracycline, and oxytetracycline are 0.125, 0.122 and 0.143 ng·L −1 , respectively. The relative standard deviations of intra-day and inter-day assays range from 3.3% to 8.5%, and from 2.8% to 8.3%, respectively. The recoveries of TCs (at spiking levels of 0.5, 5.0 and 50 ng·L −1 ) are in the range between 78.3% and 93.7%. The method was successfully applied to the determination of TCs in spiked river water, fish pond water, and livestock wastewater.
研究领域:
环境科学
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分析化学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 39
·16571-16588
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IF 7.79
Yu Zhang,Yifeng Yang,Jinsheng Shi,Lili Wang
Weak acidity (6.5–6.9) and limited H2O2 level in the tumor microenvironment (TME) usually impact the therapeutic effect of chemodynamic therapy (CDT) for cancer. A Specific TME promotes the formation of an immunosuppressive microenvironment and results in high rate of recurrence and metastasis of cancer. Fe3O4@ZIF-8/GOx@MnO2 multi-layer core shell nanostructure was constructed as a hybrid nanozyme. After magnetic targeting of the tumor site, the outermost MnO2 shell catalyzed H2O2 in TME to produce O2 and was broken due to the reaction with glutathione. Due to the acid response, the ZIF-8 layer would crack and release glucose oxidase (GOx) and Fe3O4. The generated O2 was utilized by GOx in starvation therapy to consume glucose and produce H2O2 and gluconic acid. The Fenton reaction efficiency of Fe(II) was improved by the increased H2O2 concentration and the enhanced acidity in TME. At the same time, the intrinsic photothermal effect of Fe3O4 upon 808 nm laser irradiation promoted the activity of MnO2 and GOx as oxidase, and Fe(II) as catalase-like, and ablated the primary tumor. Moreover, the hybrid nanozyme can facilitate the transformation of M2-type macrophages to M1-type, and strong systemic antitumor immune effect was induced. A synergy of multiple therapeutic modes including starvation therapy, CDT, photothermal therapy (PTT), and immunotherapy can be realized in the hybrid nanozyme for tumor therapy.
研究领域:
纳米技术
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癌症治疗
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生物医学工程
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材料科学
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免疫学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Yu Zhang,Hong Zheng,Pengyi Zhang,Qi Zuo,Baichao Zhang,Xueying Ren
The deep purification of trace heavy metals in drinking water is of great significance and has received considerable attention worldwide. 2,5-dimercapto-1,3,4-thiadiazole (DMTD) functionalized magnetic ZIF-8 adsorbent (Fe 3 O 4 @ZIF-8-DMTD) using a novel one-pot post coordination modulation method at room temperature could effectively adsorb trace heavy metals from drinking water through cooperating with the abundant functional groups and surface charges. The negative surface charges promoted the rapid accumulation of trace heavy metals on the surface of the adsorbent, meanwhile, the abundant thiol/nitrogen sites contributed to their adsorption, thus the adsorption rate and adsorption capacity of trace heavy metals were greatly improved. For trace Pb(II) (150 ppb), the effluent concentration could meet the World Health Organization (WHO) standard (≤10 ppb) within 10 s after adsorption by Fe 3 O 4 @ZIF-8-DMTD, and the cumulative adsorption capacity that met WHO standard was 12.11 mg/g. Fe 3 O 4 @ZIF-8-DMTD also showed high stability in a broad pH range and excellent adsorption performance in a wide low concentration range. The effluent concentration still could meet the WHO standard when the initial Pb(II) concentration was 11.70 ppm, and the corresponding adsorption capacity reached 35.00 mg/g. Moreover, the capture experiments for multiple heavy metals that coexisted in tap water showed that the effluent concentrations of Hg(II), Pb(II), Cu(II), Cd(II), and Cr(III) could be lower than the allowable limits in a few minutes. The adsorbent could also be easily recovered using magnets and regenerated by thiourea solution, which showed great application potential for the purification of trace heavy metals in drinking water.
研究领域:
环境科学
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材料科学
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水处理
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纳米技术
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产品关联
DOI
高影响因子
BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2024
·Vol. 47
·期 7
·1071-1080
·
IF 3.5
Sun Liqun,Xu Chaozhong,Tong Shanshan,Gu Xiaoli
This study investigates the immobilization of cellulase on zeolitic imidazolate frameworks (ZIFs) by physical adsorption, specifically the ZIF-8-NH 2 and Fe 3 O 4 @ZIF-8-NH 2 , to enhance enzymatic hydrolysis efficiency. The immobilization process was thoroughly analyzed, including optimization of conditions and characterization of ZIF carriers and immobilized enzymes. The impacts on the catalytic activity of cellulase under various temperatures, pH levels, and storage conditions were examined. Additionally, the reusability of the immobilized enzyme was assessed. Results showed the cellulase immobilized on Fe 3 O 4 @ZIF-8-NH 2 exhibited a high loading capacity of 339.64 mg/g, surpassing previous studies. Its relative enzymatic activity was found to be 71.39%. Additionally, this immobilized enzyme system demonstrates robust reusability, retaining 68.42% of its initial activity even after 10 cycles. These findings underscore the potential of Fe 3 O 4 @ZIF-8-NH 2 as a highly efficient platform for cellulase immobilization, with promising implications for lignocellulosic biorefinery.
研究领域:
生物化学
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酶工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiaming Wang,Minxin Shi,Yuanyuan Qin,Yuhua Huang,Xiancai Li,Xiaohua Cao
The enrichment and recovery of low concentration rare earth ions from wastewater resources has become an important research direction to achieve high quality utilization of rare earth resources. In this experiment, graphitic carbon nitride was used as the substrate, which was firstly compounded with Fe 3 O 4 to become magnetic graphitic carbon nitride material by alcohol heat method, and then in situ compounded with ZIF-8 in aqueous phase at room temperature to form the composite g-C 3 N 4 /Fe 3 O 4 @ZIF-8. Finally, the composite was characterized. The adsorption performance of g-C 3 N 4 /Fe 3 O 4 @ZIF-8 and the control g-C 3 N 4 /Fe 3 O 4 and ZIF-8 for La(III) under various conditions was investigated by adsorption experiment. In addition, the types and mechanism of La(III) adsorption were discussed by kinetic, isothermal adsorption line and thermodynamic modeling studies. Finally, the stability performance and reusability of the composite were evaluated by regeneration experiments. The result show that g-C 3 N 4 /Fe 3 O 4 @ZIF-8 has good adsorption performance on lanthanide ions. g-C 3 N 4 /Fe 3 O 4 @ZIF-8 reached adsorption equilibrium at about 20 min. When pH is 6 and the solid–liquid ratio of adsorbent is 0.25 g/L, the adsorption amount was 176.68 mg/g. g-C 3 N 4 /Fe 3 O 4 @ZIF-8 had good selectivity for lanthanum(III), and it retains 81 % of initial adsorption performance after five times of reuse.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhang Liu,C. Marquina,Wei Han,Joseph K.C. Kwan,M. Ricardo Ibarra,King Lun Yeung
This study presents the synthesis of Fe 3 O 4 @Zeolite Imidazolate Framework-8 (Fe 3 O 4 @ZIF-8), a novel magnetic core–shell adsorbent engineered for enhance adsorption of organic pollutants. The process begins with the formation of spherical magnetite aggregates (i.e., Fe 3 O 4 ) via a solvothermal method, using polyacrylic acid for stabilization and capping. A ZIF-8 shell is then grown through a sol gel process followed by reaction with 2-methylimidazole, resulting in a crystalline shell approximately 60 nm thick. Characterization techniques, including energy dispersive X-ray analysis and X-ray diffraction, confirm the successful preparation of Fe 3 O 4 @ZIF-8. The adsorption capabilities were evaluated using methylene blue (MB) and diclofenac sodium (DCF) as model pollutants. Fe 3 O 4 @ZIF-8 demonstrated rapid removal efficiencies, with 98 % removal of MB (6.01 × 10 -4 mg·g −1 ·min −1 ) and DCF (4.43 × 10 -4 g·mg −1 .min −1 ) within 15 and 30 min, respectively, significantly outperforming conventional activated carbon. Thermodynamic studies indicate that the adsorption processes are spontaneous; enthalpic changes drive MB adsorption, while DCF is influenced by entropic factors. Molecular modeling reveals preferential adsorption behaviors on different ZIF-8 facets, with stronger interactions for MB due to π-π stacking and hydrogen bonding. These findings underscore the potential of Fe 3 O 4 @ZIF-8 as an effective adsorbent for water purification, highlighting its substantial adsorption capacity (73.2 mg·g −1 for MB and 53.8 mg·g −1 for DCF), stability, and reusability.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
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